diff options
Diffstat (limited to 'drivers/usb/gadget/at91_udc.c')
| -rw-r--r-- | drivers/usb/gadget/at91_udc.c | 1773 |
1 files changed, 1773 insertions, 0 deletions
diff --git a/drivers/usb/gadget/at91_udc.c b/drivers/usb/gadget/at91_udc.c new file mode 100644 index 000000000000..865858cfd1c2 --- /dev/null +++ b/drivers/usb/gadget/at91_udc.c @@ -0,0 +1,1773 @@ +/* + * at91_udc -- driver for at91-series USB peripheral controller + * + * Copyright (C) 2004 by Thomas Rathbone + * Copyright (C) 2005 by HP Labs + * Copyright (C) 2005 by David Brownell + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + */ + +#undef DEBUG +#undef VERBOSE +#undef PACKET_TRACE + +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/delay.h> +#include <linux/ioport.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/smp_lock.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/list.h> +#include <linux/interrupt.h> +#include <linux/proc_fs.h> +#include <linux/clk.h> +#include <linux/usb_ch9.h> +#include <linux/usb_gadget.h> + +#include <asm/byteorder.h> +#include <asm/io.h> +#include <asm/irq.h> +#include <asm/system.h> +#include <asm/mach-types.h> + +#include <asm/arch/hardware.h> +#include <asm/arch/gpio.h> +#include <asm/arch/board.h> + +#include "at91_udc.h" + + +/* + * This controller is simple and PIO-only. It's used in many AT91-series + * ARMv4T controllers, including the at91rm9200 (arm920T, with MMU), + * at91sam9261 (arm926ejs, with MMU), and several no-mmu versions. + * + * This driver expects the board has been wired with two GPIOs suppporting + * a VBUS sensing IRQ, and a D+ pullup. (They may be omitted, but the + * testing hasn't covered such cases.) The pullup is most important; it + * provides software control over whether the host enumerates the device. + * The VBUS sensing helps during enumeration, and allows both USB clocks + * (and the transceiver) to stay gated off until they're necessary, saving + * power. During USB suspend, the 48 MHz clock is gated off. + */ + +#define DRIVER_VERSION "8 March 2005" + +static const char driver_name [] = "at91_udc"; +static const char ep0name[] = "ep0"; + +/*-------------------------------------------------------------------------*/ + +/* + * Read from a UDP register. + */ +static inline unsigned long at91_udp_read(unsigned int reg) +{ + void __iomem *udp_base = (void __iomem *)AT91_VA_BASE_UDP; + + return __raw_readl(udp_base + reg); +} + +/* + * Write to a UDP register. + */ +static inline void at91_udp_write(unsigned int reg, unsigned long value) +{ + void __iomem *udp_base = (void __iomem *)AT91_VA_BASE_UDP; + + __raw_writel(value, udp_base + reg); +} + +/*-------------------------------------------------------------------------*/ + +#ifdef CONFIG_USB_GADGET_DEBUG_FILES + +#include <linux/seq_file.h> + +static const char debug_filename[] = "driver/udc"; + +#define FOURBITS "%s%s%s%s" +#define EIGHTBITS FOURBITS FOURBITS + +static void proc_ep_show(struct seq_file *s, struct at91_ep *ep) +{ + static char *types[] = { + "control", "out-iso", "out-bulk", "out-int", + "BOGUS", "in-iso", "in-bulk", "in-int"}; + + u32 csr; + struct at91_request *req; + unsigned long flags; + + local_irq_save(flags); + + csr = __raw_readl(ep->creg); + + /* NOTE: not collecting per-endpoint irq statistics... */ + + seq_printf(s, "\n"); + seq_printf(s, "%s, maxpacket %d %s%s %s%s\n", + ep->ep.name, ep->ep.maxpacket, + ep->is_in ? "in" : "out", + ep->is_iso ? " iso" : "", + ep->is_pingpong + ? (ep->fifo_bank ? "pong" : "ping") + : "", + ep->stopped ? " stopped" : ""); + seq_printf(s, "csr %08x rxbytes=%d %s %s %s" EIGHTBITS "\n", + csr, + (csr & 0x07ff0000) >> 16, + (csr & (1 << 15)) ? "enabled" : "disabled", + (csr & (1 << 11)) ? "DATA1" : "DATA0", + types[(csr & 0x700) >> 8], + + /* iff type is control then print current direction */ + (!(csr & 0x700)) + ? ((csr & (1 << 7)) ? " IN" : " OUT") + : "", + (csr & (1 << 6)) ? " rxdatabk1" : "", + (csr & (1 << 5)) ? " forcestall" : "", + (csr & (1 << 4)) ? " txpktrdy" : "", + + (csr & (1 << 3)) ? " stallsent" : "", + (csr & (1 << 2)) ? " rxsetup" : "", + (csr & (1 << 1)) ? " rxdatabk0" : "", + (csr & (1 << 0)) ? " txcomp" : ""); + if (list_empty (&ep->queue)) + seq_printf(s, "\t(queue empty)\n"); + + else list_for_each_entry (req, &ep->queue, queue) { + unsigned length = req->req.actual; + + seq_printf(s, "\treq %p len %d/%d buf %p\n", + &req->req, length, + req->req.length, req->req.buf); + } + local_irq_restore(flags); +} + +static void proc_irq_show(struct seq_file *s, const char *label, u32 mask) +{ + int i; + + seq_printf(s, "%s %04x:%s%s" FOURBITS, label, mask, + (mask & (1 << 13)) ? " wakeup" : "", + (mask & (1 << 12)) ? " endbusres" : "", + + (mask & (1 << 11)) ? " sofint" : "", + (mask & (1 << 10)) ? " extrsm" : "", + (mask & (1 << 9)) ? " rxrsm" : "", + (mask & (1 << 8)) ? " rxsusp" : ""); + for (i = 0; i < 8; i++) { + if (mask & (1 << i)) + seq_printf(s, " ep%d", i); + } + seq_printf(s, "\n"); +} + +static int proc_udc_show(struct seq_file *s, void *unused) +{ + struct at91_udc *udc = s->private; + struct at91_ep *ep; + u32 tmp; + + seq_printf(s, "%s: version %s\n", driver_name, DRIVER_VERSION); + + seq_printf(s, "vbus %s, pullup %s, %s powered%s, gadget %s\n\n", + udc->vbus ? "present" : "off", + udc->enabled + ? (udc->vbus ? "active" : "enabled") + : "disabled", + udc->selfpowered ? "self" : "VBUS", + udc->suspended ? ", suspended" : "", + udc->driver ? udc->driver->driver.name : "(none)"); + + /* don't access registers when interface isn't clocked */ + if (!udc->clocked) { + seq_printf(s, "(not clocked)\n"); + return 0; + } + + tmp = at91_udp_read(AT91_UDP_FRM_NUM); + seq_printf(s, "frame %05x:%s%s frame=%d\n", tmp, + (tmp & AT91_UDP_FRM_OK) ? " ok" : "", + (tmp & AT91_UDP_FRM_ERR) ? " err" : "", + (tmp & AT91_UDP_NUM)); + + tmp = at91_udp_read(AT91_UDP_GLB_STAT); + seq_printf(s, "glbstate %02x:%s" FOURBITS "\n", tmp, + (tmp & AT91_UDP_RMWUPE) ? " rmwupe" : "", + (tmp & AT91_UDP_RSMINPR) ? " rsminpr" : "", + (tmp & AT91_UDP_ESR) ? " esr" : "", + (tmp & AT91_UDP_CONFG) ? " confg" : "", + (tmp & AT91_UDP_FADDEN) ? " fadden" : ""); + + tmp = at91_udp_read(AT91_UDP_FADDR); + seq_printf(s, "faddr %03x:%s fadd=%d\n", tmp, + (tmp & AT91_UDP_FEN) ? " fen" : "", + (tmp & AT91_UDP_FADD)); + + proc_irq_show(s, "imr ", at91_udp_read(AT91_UDP_IMR)); + proc_irq_show(s, "isr ", at91_udp_read(AT91_UDP_ISR)); + + if (udc->enabled && udc->vbus) { + proc_ep_show(s, &udc->ep[0]); + list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) { + if (ep->desc) + proc_ep_show(s, ep); + } + } + return 0; +} + +static int proc_udc_open(struct inode *inode, struct file *file) +{ + return single_open(file, proc_udc_show, PDE(inode)->data); +} + +static struct file_operations proc_ops = { + .open = proc_udc_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static void create_debug_file(struct at91_udc *udc) +{ + struct proc_dir_entry *pde; + + pde = create_proc_entry (debug_filename, 0, NULL); + udc->pde = pde; + if (pde == NULL) + return; + + pde->proc_fops = &proc_ops; + pde->data = udc; +} + +static void remove_debug_file(struct at91_udc *udc) +{ + if (udc->pde) + remove_proc_entry(debug_filename, NULL); +} + +#else + +static inline void create_debug_file(struct at91_udc *udc) {} +static inline void remove_debug_file(struct at91_udc *udc) {} + +#endif + + +/*-------------------------------------------------------------------------*/ + +static void done(struct at91_ep *ep, struct at91_request *req, int status) +{ + unsigned stopped = ep->stopped; + + list_del_init(&req->queue); + if (req->req.status == -EINPROGRESS) + req->req.status = status; + else + status = req->req.status; + if (status && status != -ESHUTDOWN) + VDBG("%s done %p, status %d\n", ep->ep.name, req, status); + + ep->stopped = 1; + req->req.complete(&ep->ep, &req->req); + ep->stopped = stopped; + + /* ep0 is always ready; other endpoints need a non-empty queue */ + if (list_empty(&ep->queue) && ep->int_mask != (1 << 0)) + at91_udp_write(AT91_UDP_IDR, ep->int_mask); +} + +/*-------------------------------------------------------------------------*/ + +/* bits indicating OUT fifo has data ready */ +#define RX_DATA_READY (AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1) + +/* + * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write + * back most of the value you just read (because of side effects, including + * bits that may change after reading and before writing). + * + * Except when changing a specific bit, always write values which: + * - clear SET_FX bits (setting them could change something) + * - set CLR_FX bits (clearing them could change something) + * + * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE + * that shouldn't normally be changed. + */ +#define SET_FX (AT91_UDP_TXPKTRDY) +#define CLR_FX (RX_DATA_READY | AT91_UDP_RXSETUP | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP) + +/* pull OUT packet data from the endpoint's fifo */ +static int read_fifo (struct at91_ep *ep, struct at91_request *req) +{ + u32 __iomem *creg = ep->creg; + u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0)); + u32 csr; + u8 *buf; + unsigned int count, bufferspace, is_done; + + buf = req->req.buf + req->req.actual; + bufferspace = req->req.length - req->req.actual; + + /* + * there might be nothing to read if ep_queue() calls us, + * or if we already emptied both pingpong buffers + */ +rescan: + csr = __raw_readl(creg); + if ((csr & RX_DATA_READY) == 0) + return 0; + + count = (csr & AT91_UDP_RXBYTECNT) >> 16; + if (count > ep->ep.maxpacket) + count = ep->ep.maxpacket; + if (count > bufferspace) { + DBG("%s buffer overflow\n", ep->ep.name); + req->req.status = -EOVERFLOW; + count = bufferspace; + } + __raw_readsb(dreg, buf, count); + + /* release and swap pingpong mem bank */ + csr |= CLR_FX; + if (ep->is_pingpong) { + if (ep->fifo_bank == 0) { + csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0); + ep->fifo_bank = 1; + } else { + csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK1); + ep->fifo_bank = 0; + } + } else + csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0); + __raw_writel(csr, creg); + + req->req.actual += count; + is_done = (count < ep->ep.maxpacket); + if (count == bufferspace) + is_done = 1; + + PACKET("%s %p out/%d%s\n", ep->ep.name, &req->req, count, + is_done ? " (done)" : ""); + + /* + * avoid extra trips through IRQ logic for packets already in + * the fifo ... maybe preventing an extra (expensive) OUT-NAK + */ + if (is_done) + done(ep, req, 0); + else if (ep->is_pingpong) { + bufferspace -= count; + buf += count; + goto rescan; + } + + return is_done; +} + +/* load fifo for an IN packet */ +static int write_fifo(struct at91_ep *ep, struct at91_request *req) +{ + u32 __iomem *creg = ep->creg; + u32 csr = __raw_readl(creg); + u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0)); + unsigned total, count, is_last; + + /* + * TODO: allow for writing two packets to the fifo ... that'll + * reduce the amount of IN-NAKing, but probably won't affect + * throughput much. (Unlike preventing OUT-NAKing!) + */ + + /* + * If ep_queue() calls us, the queue is empty and possibly in + * odd states like TXCOMP not yet cleared (we do it, saving at + * least one IRQ) or the fifo not yet being free. Those aren't + * issues normally (IRQ handler fast path). + */ + if (unlikely(csr & (AT91_UDP_TXCOMP | AT91_UDP_TXPKTRDY))) { + if (csr & AT91_UDP_TXCOMP) { + csr |= CLR_FX; + csr &= ~(SET_FX | AT91_UDP_TXCOMP); + __raw_writel(csr, creg); + csr = __raw_readl(creg); + } + if (csr & AT91_UDP_TXPKTRDY) + return 0; + } + + total = req->req.length - req->req.actual; + if (ep->ep.maxpacket < total) { + count = ep->ep.maxpacket; + is_last = 0; + } else { + count = total; + is_last = (count < ep->ep.maxpacket) || !req->req.zero; + } + + /* + * Write the packet, maybe it's a ZLP. + * + * NOTE: incrementing req->actual before we receive the ACK means + * gadget driver IN bytecounts can be wrong in fault cases. That's + * fixable with PIO drivers like this one (save "count" here, and + * do the increment later on TX irq), but not for most DMA hardware. + * + * So all gadget drivers must accept that potential error. Some + * hardware supports precise fifo status reporting, letting them + * recover when the actual bytecount matters (e.g. for USB Test + * and Measurement Class devices). + */ + __raw_writesb(dreg, req->req.buf + req->req.actual, count); + csr &= ~SET_FX; + csr |= CLR_FX | AT91_UDP_TXPKTRDY; + __raw_writel(csr, creg); + req->req.actual += count; + + PACKET("%s %p in/%d%s\n", ep->ep.name, &req->req, count, + is_last ? " (done)" : ""); + if (is_last) + done(ep, req, 0); + return is_last; +} + +static void nuke(struct at91_ep *ep, int status) +{ + struct at91_request *req; + + // terminer chaque requete dans la queue + ep->stopped = 1; + if (list_empty(&ep->queue)) + return; + + VDBG("%s %s\n", __FUNCTION__, ep->ep.name); + while (!list_empty(&ep->queue)) { + req = list_entry(ep->queue.next, struct at91_request, queue); + done(ep, req, status); + } +} + +/*-------------------------------------------------------------------------*/ + +static int at91_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc) +{ + struct at91_ep *ep = container_of(_ep, struct at91_ep, ep); + struct at91_udc *dev = ep->udc; + u16 maxpacket; + u32 tmp; + unsigned long flags; + + if (!_ep || !ep + || !desc || ep->desc + || _ep->name == ep0name + || desc->bDescriptorType != USB_DT_ENDPOINT + || (maxpacket = le16_to_cpu(desc->wMaxPacketSize)) == 0 + || maxpacket > ep->maxpacket) { + DBG("bad ep or descriptor\n"); + return -EINVAL; + } + + if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) { + DBG("bogus device state\n"); + return -ESHUTDOWN; + } + + tmp = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK; + switch (tmp) { + case USB_ENDPOINT_XFER_CONTROL: + DBG("only one control endpoint\n"); + return -EINVAL; + case USB_ENDPOINT_XFER_INT: + if (maxpacket > 64) + goto bogus_max; + break; + case USB_ENDPOINT_XFER_BULK: + switch (maxpacket) { + case 8: + case 16: + case 32: + case 64: + goto ok; + } +bogus_max: + DBG("bogus maxpacket %d\n", maxpacket); + return -EINVAL; + case USB_ENDPOINT_XFER_ISOC: + if (!ep->is_pingpong) { + DBG("iso requires double buffering\n"); + return -EINVAL; + } + break; + } + +ok: + local_irq_save(flags); + + /* initialize endpoint to match this descriptor */ + ep->is_in = (desc->bEndpointAddress & USB_DIR_IN) != 0; + ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC); + ep->stopped = 0; + if (ep->is_in) + tmp |= 0x04; + tmp <<= 8; + tmp |= AT91_UDP_EPEDS; + __raw_writel(tmp, ep->creg); + + ep->desc = desc; + ep->ep.maxpacket = maxpacket; + + /* + * reset/init endpoint fifo. NOTE: leaves fifo_bank alone, + * since endpoint resets don't reset hw pingpong state. + */ + at91_udp_write(AT91_UDP_RST_EP, ep->int_mask); + at91_udp_write(AT91_UDP_RST_EP, 0); + + local_irq_restore(flags); + return 0; +} + +static int at91_ep_disable (struct usb_ep * _ep) +{ + struct at91_ep *ep = container_of(_ep, struct at91_ep, ep); + unsigned long flags; + + if (ep == &ep->udc->ep[0]) + return -EINVAL; + + local_irq_save(flags); + + nuke(ep, -ESHUTDOWN); + + /* restore the endpoint's pristine config */ + ep->desc = NULL; + ep->ep.maxpacket = ep->maxpacket; + + /* reset fifos and endpoint */ + if (ep->udc->clocked) { + at91_udp_write(AT91_UDP_RST_EP, ep->int_mask); + at91_udp_write(AT91_UDP_RST_EP, 0); + __raw_writel(0, ep->creg); + } + + local_irq_restore(flags); + return 0; +} + +/* + * this is a PIO-only driver, so there's nothing + * interesting for request or buffer allocation. + */ + +static struct usb_request *at91_ep_alloc_request (struct usb_ep *_ep, unsigned int gfp_flags) +{ + struct at91_request *req; + + req = kcalloc(1, sizeof (struct at91_request), SLAB_KERNEL); + if (!req) + return NULL; + + INIT_LIST_HEAD(&req->queue); + return &req->req; +} + +static void at91_ep_free_request(struct usb_ep *_ep, struct usb_request *_req) +{ + struct at91_request *req; + + req = container_of(_req, struct at91_request, req); + BUG_ON(!list_empty(&req->queue)); + kfree(req); +} + +static void *at91_ep_alloc_buffer( + struct usb_ep *_ep, + unsigned bytes, + dma_addr_t *dma, + gfp_t gfp_flags) +{ + *dma = ~0; + return kmalloc(bytes, gfp_flags); +} + +static void at91_ep_free_buffer( + struct usb_ep *ep, + void *buf, + dma_addr_t dma, + unsigned bytes) +{ + kfree(buf); +} + +static int at91_ep_queue(struct usb_ep *_ep, + struct usb_request *_req, gfp_t gfp_flags) +{ + struct at91_request *req; + struct at91_ep *ep; + struct at91_udc *dev; + int status; + unsigned long flags; + + req = container_of(_req, struct at91_request, req); + ep = container_of(_ep, struct at91_ep, ep); + + if (!_req || !_req->complete + || !_req->buf || !list_empty(&req->queue)) { + DBG("invalid request\n"); + return -EINVAL; + } + + if (!_ep || (!ep->desc && ep->ep.name != ep0name)) { + DBG("invalid ep\n"); + return -EINVAL; + } + + dev = ep->udc; + + if (!dev || !dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) { + DBG("invalid device\n"); + return -EINVAL; + } + + _req->status = -EINPROGRESS; + _req->actual = 0; + + local_irq_save(flags); + + /* try to kickstart any empty and idle queue */ + if (list_empty(&ep->queue) && !ep->stopped) { + int is_ep0; + + /* + * If this control request has a non-empty DATA stage, this + * will start that stage. It works just like a non-control + * request (until the status stage starts, maybe early). + * + * If the data stage is empty, then this starts a successful + * IN/STATUS stage. (Unsuccessful ones use set_halt.) + */ + is_ep0 = (ep->ep.name == ep0name); + if (is_ep0) { + u32 tmp; + + if (!dev->req_pending) { + status = -EINVAL; + goto done; + } + + /* + * defer changing CONFG until after the gadget driver + * reconfigures the endpoints. + */ + if (dev->wait_for_config_ack) { + tmp = at91_udp_read(AT91_UDP_GLB_STAT); + tmp ^= AT91_UDP_CONFG; + VDBG("toggle config\n"); + at91_udp_write(AT91_UDP_GLB_STAT, tmp); + } + if (req->req.length == 0) { +ep0_in_status: + PACKET("ep0 in/status\n"); + status = 0; + tmp = __raw_readl(ep->creg); + tmp &= ~SET_FX; + tmp |= CLR_FX | AT91_UDP_TXPKTRDY; + __raw_writel(tmp, ep->creg); + dev->req_pending = 0; + goto done; + } + } + + if (ep->is_in) + status = write_fifo(ep, req); + else { + status = read_fifo(ep, req); + + /* IN/STATUS stage is otherwise triggered by irq */ + if (status && is_ep0) + goto ep0_in_status; + } + } else + status = 0; + + if (req && !status) { + list_add_tail (&req->queue, &ep->queue); + at91_udp_write(AT91_UDP_IER, ep->int_mask); + } +done: + local_irq_restore(flags); + return (status < 0) ? status : 0; +} + +static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req) +{ + struct at91_ep *ep; + struct at91_request *req; + + ep = container_of(_ep, struct at91_ep, ep); + if (!_ep || ep->ep.name == ep0name) + return -EINVAL; + + /* make sure it's actually queued on this endpoint */ + list_for_each_entry (req, &ep->queue, queue) { + if (&req->req == _req) + break; + } + if (&req->req != _req) + return -EINVAL; + + done(ep, req, -ECONNRESET); + return 0; +} + +static int at91_ep_set_halt(struct usb_ep *_ep, int value) +{ + struct at91_ep *ep = container_of(_ep, struct at91_ep, ep); + u32 __iomem *creg; + u32 csr; + unsigned long flags; + int status = 0; + + if (!_ep || ep->is_iso || !ep->udc->clocked) + return -EINVAL; + + creg = ep->creg; + local_irq_save(flags); + + csr = __raw_readl(creg); + + /* + * fail with still-busy IN endpoints, ensuring correct sequencing + * of data tx then stall. note that the fifo rx bytecount isn't + * completely accurate as a tx bytecount. + */ + if (ep->is_in && (!list_empty(&ep->queue) || (csr >> 16) != 0)) + status = -EAGAIN; + else { + csr |= CLR_FX; + csr &= ~SET_FX; + if (value) { + csr |= AT91_UDP_FORCESTALL; + VDBG("halt %s\n", ep->ep.name); + } else { + at91_udp_write(AT91_UDP_RST_EP, ep->int_mask); + at91_udp_write(AT91_UDP_RST_EP, 0); + csr &= ~AT91_UDP_FORCESTALL; + } + __raw_writel(csr, creg); + } + + local_irq_restore(flags); + return status; +} + +static struct usb_ep_ops at91_ep_ops = { + .enable = at91_ep_enable, + .disable = at91_ep_disable, + .alloc_request = at91_ep_alloc_request, + .free_request = at91_ep_free_request, + .alloc_buffer = at91_ep_alloc_buffer, + .free_buffer = at91_ep_free_buffer, + .queue = at91_ep_queue, + .dequeue = at91_ep_dequeue, + .set_halt = at91_ep_set_halt, + // there's only imprecise fifo status reporting +}; + +/*-------------------------------------------------------------------------*/ + +static int at91_get_frame(struct usb_gadget *gadget) +{ + if (!to_udc(gadget)->clocked) + return -EINVAL; + return at91_udp_read(AT91_UDP_FRM_NUM) & AT91_UDP_NUM; +} + +static int at91_wakeup(struct usb_gadget *gadget) +{ + struct at91_udc *udc = to_udc(gadget); + u32 glbstate; + int status = -EINVAL; + unsigned long flags; + + DBG("%s\n", __FUNCTION__ ); + local_irq_save(flags); + + if (!udc->clocked || !udc->suspended) + goto done; + + /* NOTE: some "early versions" handle ESR differently ... */ + + glbstate = at91_udp_read(AT91_UDP_GLB_STAT); + if (!(glbstate & AT91_UDP_ESR)) + goto done; + glbstate |= AT91_UDP_ESR; + at91_udp_write(AT91_UDP_GLB_STAT, glbstate); + +done: + local_irq_restore(flags); + return status; +} + +/* reinit == restore inital software state */ +static void udc_reinit(struct at91_udc *udc) +{ + u32 i; + + INIT_LIST_HEAD(&udc->gadget.ep_list); + INIT_LIST_HEAD(&udc->gadget.ep0->ep_list); + + for (i = 0; i < NUM_ENDPOINTS; i++) { + struct at91_ep *ep = &udc->ep[i]; + + if (i != 0) + list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list); + ep->desc = NULL; + ep->stopped = 0; + ep->fifo_bank = 0; + ep->ep.maxpacket = ep->maxpacket; + // initialiser une queue par endpoint + INIT_LIST_HEAD(&ep->queue); + } +} + +static void stop_activity(struct at91_udc *udc) +{ + struct usb_gadget_driver *driver = udc->driver; + int i; + + if (udc->gadget.speed == USB_SPEED_UNKNOWN) + driver = NULL; + udc->gadget.speed = USB_SPEED_UNKNOWN; + + for (i = 0; i < NUM_ENDPOINTS; i++) { + struct at91_ep *ep = &udc->ep[i]; + ep->stopped = 1; + nuke(ep, -ESHUTDOWN); + } + if (driver) + driver->disconnect(&udc->gadget); + + udc_reinit(udc); +} + +static void clk_on(struct at91_udc *udc) +{ + if (udc->clocked) + return; + udc->clocked = 1; + clk_enable(udc->iclk); + clk_enable(udc->fclk); +} + +static void clk_off(struct at91_udc *udc) +{ + if (!udc->clocked) + return; + udc->clocked = 0; + udc->gadget.speed = USB_SPEED_UNKNOWN; + clk_disable(udc->iclk); + clk_disable(udc->fclk); +} + +/* + * activate/deactivate link with host; minimize power usage for + * inactive links by cutting clocks and transceiver power. + */ +static void pullup(struct at91_udc *udc, int is_on) +{ + if (!udc->enabled || !udc->vbus) + is_on = 0; + DBG("%sactive\n", is_on ? "" : "in"); + if (is_on) { + clk_on(udc); + at91_udp_write(AT91_UDP_TXVC, 0); + at91_set_gpio_value(udc->board.pullup_pin, 1); + } else { + stop_activity(udc); + at91_udp_write(AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS); + at91_set_gpio_value(udc->board.pullup_pin, 0); + clk_off(udc); + + // REVISIT: with transceiver disabled, will D- float + // so that a host would falsely detect a device? + } +} + +/* vbus is here! turn everything on that's ready */ +static int at91_vbus_session(struct usb_gadget *gadget, int is_active) +{ + struct at91_udc *udc = to_udc(gadget); + unsigned long flags; + + // VDBG("vbus %s\n", is_active ? "on" : "off"); + local_irq_save(flags); + udc->vbus = (is_active != 0); + pullup(udc, is_active); + local_irq_restore(flags); + return 0; +} + +static int at91_pullup(struct usb_gadget *gadget, int is_on) +{ + struct at91_udc *udc = to_udc(gadget); + unsigned long flags; + + local_irq_save(flags); + udc->enabled = is_on = !!is_on; + pullup(udc, is_on); + local_irq_restore(flags); + return 0; +} + +static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on) +{ + struct at91_udc *udc = to_udc(gadget); + unsigned long flags; + + local_irq_save(flags); + udc->selfpowered = (is_on != 0); + local_irq_restore(flags); + return 0; +} + +static const struct usb_gadget_ops at91_udc_ops = { + .get_frame = at91_get_frame, + .wakeup = at91_wakeup, + .set_selfpowered = at91_set_selfpowered, + .vbus_session = at91_vbus_session, + .pullup = at91_pullup, + + /* + * VBUS-powered devices may also also want to support bigger + * power budgets after an appropriate SET_CONFIGURATION. + */ + // .vbus_power = at91_vbus_power, +}; + +/*-------------------------------------------------------------------------*/ + +static int handle_ep(struct at91_ep *ep) +{ + struct at91_request *req; + u32 __iomem *creg = ep->creg; + u32 csr = __raw_readl(creg); + + if (!list_empty(&ep->queue)) + req = list_entry(ep->queue.next, + struct at91_request, queue); + else + req = NULL; + + if (ep->is_in) { + if (csr & (AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)) { + csr |= CLR_FX; + csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP); + __raw_writel(csr, creg); + } + if (req) + return write_fifo(ep, req); + + } else { + if (csr & AT91_UDP_STALLSENT) { + /* STALLSENT bit == ISOERR */ + if (ep->is_iso && req) + req->req.status = -EILSEQ; + csr |= CLR_FX; + csr &= ~(SET_FX | AT91_UDP_STALLSENT); + __raw_writel(csr, creg); + csr = __raw_readl(creg); + } + if (req && (csr & RX_DATA_READY)) + return read_fifo(ep, req); + } + return 0; +} + +union setup { + u8 raw[8]; + struct usb_ctrlrequest r; +}; + +static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr) +{ + u32 __iomem *creg = ep->creg; + u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0)); + unsigned rxcount, i = 0; + u32 tmp; + union setup pkt; + int status = 0; + + /* read and ack SETUP; hard-fail for bogus packets */ + rxcount = (csr & AT91_UDP_RXBYTECNT) >> 16; + if (likely(rxcount == 8)) { + while (rxcount--) + pkt.raw[i++] = __raw_readb(dreg); + if (pkt.r.bRequestType & USB_DIR_IN) { + csr |= AT91_UDP_DIR; + ep->is_in = 1; + } else { + csr &= ~AT91_UDP_DIR; + ep->is_in = 0; + } + } else { + // REVISIT this happens sometimes under load; why?? + ERR("SETUP len %d, csr %08x\n", rxcount, csr); + status = -EINVAL; + } + csr |= CLR_FX; + csr &= ~(SET_FX | AT91_UDP_RXSETUP); + __raw_writel(csr, creg); + udc->wait_for_addr_ack = 0; + udc->wait_for_config_ack = 0; + ep->stopped = 0; + if (unlikely(status != 0)) + goto stall; + +#define w_index le16_to_cpu(pkt.r.wIndex) +#define w_value le16_to_cpu(pkt.r.wValue) +#define w_length le16_to_cpu(pkt.r.wLength) + + VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n", + pkt.r.bRequestType, pkt.r.bRequest, + w_value, w_index, w_length); + + /* + * A few standard requests get handled here, ones that touch + * hardware ... notably for device and endpoint features. + */ + udc->req_pending = 1; + csr = __raw_readl(creg); + csr |= CLR_FX; + csr &= ~SET_FX; + switch ((pkt.r.bRequestType << 8) | pkt.r.bRequest) { + + case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) + | USB_REQ_SET_ADDRESS: + __raw_writel(csr | AT91_UDP_TXPKTRDY, creg); + udc->addr = w_value; + udc->wait_for_addr_ack = 1; + udc->req_pending = 0; + /* FADDR is set later, when we ack host STATUS */ + return; + + case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) + | USB_REQ_SET_CONFIGURATION: + tmp = at91_udp_read(AT91_UDP_GLB_STAT) & AT91_UDP_CONFG; + if (pkt.r.wValue) + udc->wait_for_config_ack = (tmp == 0); + else + udc->wait_for_config_ack = (tmp != 0); + if (udc->wait_for_config_ack) + VDBG("wait for config\n"); + /* CONFG is toggled later, if gadget driver succeeds */ + break; + + /* + * Hosts may set or clear remote wakeup status, and + * devices may report they're VBUS powered. + */ + case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) + | USB_REQ_GET_STATUS: + tmp = (udc->selfpowered << USB_DEVICE_SELF_POWERED); + if (at91_udp_read(AT91_UDP_GLB_STAT) & AT91_UDP_ESR) + tmp |= (1 << USB_DEVICE_REMOTE_WAKEUP); + PACKET("get device status\n"); + __raw_writeb(tmp, dreg); + __raw_writeb(0, dreg); + goto write_in; + /* then STATUS starts later, automatically */ + case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) + | USB_REQ_SET_FEATURE: + if (w_value != USB_DEVICE_REMOTE_WAKEUP) + goto stall; + tmp = at91_udp_read(AT91_UDP_GLB_STAT); + tmp |= AT91_UDP_ESR; + at91_udp_write(AT91_UDP_GLB_STAT, tmp); + goto succeed; + case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) + | USB_REQ_CLEAR_FEATURE: + if (w_value != USB_DEVICE_REMOTE_WAKEUP) + goto stall; + tmp = at91_udp_read(AT91_UDP_GLB_STAT); + tmp &= ~AT91_UDP_ESR; + at91_udp_write(AT91_UDP_GLB_STAT, tmp); + goto succeed; + + /* + * Interfaces have no feature settings; this is pretty useless. + * we won't even insist the interface exists... + */ + case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8) + | USB_REQ_GET_STATUS: + PACKET("get interface status\n"); + __raw_writeb(0, dreg); + __raw_writeb(0, dreg); + goto write_in; + /* then STATUS starts later, automatically */ + case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8) + | USB_REQ_SET_FEATURE: + case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8) + | USB_REQ_CLEAR_FEATURE: + goto stall; + + /* + * Hosts may clear bulk/intr endpoint halt after the gadget + * driver sets it (not widely used); or set it (for testing) + */ + case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8) + | USB_REQ_GET_STATUS: + tmp = w_index & USB_ENDPOINT_NUMBER_MASK; + ep = &udc->ep[tmp]; + if (tmp > NUM_ENDPOINTS || (tmp && !ep->desc)) + goto stall; + + if (tmp) { + if ((w_index & USB_DIR_IN)) { + if (!ep->is_in) + goto stall; + } else if (ep->is_in) + goto stall; + } + PACKET("get %s status\n", ep->ep.name); + if (__raw_readl(ep->creg) & AT91_UDP_FORCESTALL) + tmp = (1 << USB_ENDPOINT_HALT); + else + tmp = 0; + __raw_writeb(tmp, dreg); + __raw_writeb(0, dreg); + goto write_in; + /* then STATUS starts later, automatically */ + case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8) + | USB_REQ_SET_FEATURE: + tmp = w_index & USB_ENDPOINT_NUMBER_MASK; + ep = &udc->ep[tmp]; + if (w_value != USB_ENDPOINT_HALT || tmp > NUM_ENDPOINTS) + goto stall; + if (!ep->desc || ep->is_iso) + goto stall; + if ((w_index & USB_DIR_IN)) { + if (!ep->is_in) + goto stall; + } else if (ep->is_in) + goto stall; + + tmp = __raw_readl(ep->creg); + tmp &= ~SET_FX; + tmp |= CLR_FX | AT91_UDP_FORCESTALL; + __raw_writel(tmp, ep->creg); + goto succeed; + case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8) + | USB_REQ_CLEAR_FEATURE: + tmp = w_index & USB_ENDPOINT_NUMBER_MASK; + ep = &udc->ep[tmp]; + if (w_value != USB_ENDPOINT_HALT || tmp > NUM_ENDPOINTS) + goto stall; + if (tmp == 0) + goto succeed; + if (!ep->desc || ep->is_iso) + goto stall; + if ((w_index & USB_DIR_IN)) { + if (!ep->is_in) + goto stall; + } else if (ep->is_in) + goto stall; + + at91_udp_write(AT91_UDP_RST_EP, ep->int_mask); + at91_udp_write(AT91_UDP_RST_EP, 0); + tmp = __raw_readl(ep->creg); + tmp |= CLR_FX; + tmp &= ~(SET_FX | AT91_UDP_FORCESTALL); + __raw_writel(tmp, ep->creg); + if (!list_empty(&ep->queue)) + handle_ep(ep); + goto succeed; + } + +#undef w_value +#undef w_index +#undef w_length + + /* pass request up to the gadget driver */ + status = udc->driver->setup(&udc->gadget, &pkt.r); + if (status < 0) { +stall: + VDBG("req %02x.%02x protocol STALL; stat %d\n", + pkt.r.bRequestType, pkt.r.bRequest, status); + csr |= AT91_UDP_FORCESTALL; + __raw_writel(csr, creg); + udc->req_pending = 0; + } + return; + +succeed: + /* immediate successful (IN) STATUS after zero length DATA */ + PACKET("ep0 in/status\n"); +write_in: + csr |= AT91_UDP_TXPKTRDY; + __raw_writel(csr, creg); + udc->req_pending = 0; + return; +} + +static void handle_ep0(struct at91_udc *udc) +{ + struct at91_ep *ep0 = &udc->ep[0]; + u32 __iomem *creg = ep0->creg; + u32 csr = __raw_readl(creg); + struct at91_request *req; + + if (unlikely(csr & AT91_UDP_STALLSENT)) { + nuke(ep0, -EPROTO); + udc->req_pending = 0; + csr |= CLR_FX; + csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_FORCESTALL); + __raw_writel(csr, creg); + VDBG("ep0 stalled\n"); + csr = __raw_readl(creg); + } + if (csr & AT91_UDP_RXSETUP) { + nuke(ep0, 0); + udc->req_pending = 0; + handle_setup(udc, ep0, csr); + return; + } + + if (list_empty(&ep0->queue)) + req = NULL; + else + req = list_entry(ep0->queue.next, struct at91_request, queue); + + /* host ACKed an IN packet that we sent */ + if (csr & AT91_UDP_TXCOMP) { + csr |= CLR_FX; + csr &= ~(SET_FX | AT91_UDP_TXCOMP); + + /* write more IN DATA? */ + if (req && ep0->is_in) { + if (handle_ep(ep0)) + udc->req_pending = 0; + + /* + * Ack after: + * - last IN DATA packet (including GET_STATUS) + * - IN/STATUS for OUT DATA + * - IN/STATUS for any zero-length DATA stage + * except for the IN DATA case, the host should send + * an OUT status later, which we'll ack. + */ + } else { + udc->req_pending = 0; + __raw_writel(csr, creg); + + /* + * SET_ADDRESS takes effect only after the STATUS + * (to the original address) gets acked. + */ + if (udc->wait_for_addr_ack) { + u32 tmp; + + at91_udp_write(AT91_UDP_FADDR, AT91_UDP_FEN | udc->addr); + tmp = at91_udp_read(AT91_UDP_GLB_STAT); + tmp &= ~AT91_UDP_FADDEN; + if (udc->addr) + tmp |= AT91_UDP_FADDEN; + at91_udp_write(AT91_UDP_GLB_STAT, tmp); + + udc->wait_for_addr_ack = 0; + VDBG("address %d\n", udc->addr); + } + } + } + + /* OUT packet arrived ... */ + else if (csr & AT91_UDP_RX_DATA_BK0) { + csr |= CLR_FX; + csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0); + + /* OUT DATA stage */ + if (!ep0->is_in) { + if (req) { + if (handle_ep(ep0)) { + /* send IN/STATUS */ + PACKET("ep0 in/status\n"); + csr = __raw_readl(creg); + csr &= ~SET_FX; + csr |= CLR_FX | AT91_UDP_TXPKTRDY; + __raw_writel(csr, creg); + udc->req_pending = 0; + } + } else if (udc->req_pending) { + /* + * AT91 hardware has a hard time with this + * "deferred response" mode for control-OUT + * transfers. (For control-IN it's fine.) + * + * The normal solution leaves OUT data in the + * fifo until the gadget driver is ready. + * We couldn't do that here without disabling + * the IRQ that tells about SETUP packets, + * e.g. when the host gets impatient... + * + * Working around it by copying into a buffer + * would almost be a non-deferred response, + * except that it wouldn't permit reliable + * stalling of the request. Instead, demand + * that gadget drivers not use this mode. + */ + DBG("no control-OUT deferred responses!\n"); + __raw_writel(csr | AT91_UDP_FORCESTALL, creg); + udc->req_pending = 0; + } + + /* STATUS stage for control-IN; ack. */ + } else { + PACKET("ep0 out/status ACK\n"); + __raw_writel(csr, creg); + + /* "early" status stage */ + if (req) + done(ep0, req, 0); + } + } +} + +static irqreturn_t at91_udc_irq (int irq, void *_udc, struct pt_regs *r) +{ + struct at91_udc *udc = _udc; + u32 rescans = 5; + + while (rescans--) { + u32 status = at91_udp_read(AT91_UDP_ISR); + + status &= at91_udp_read(AT91_UDP_IMR); + if (!status) + break; + + /* USB reset irq: not maskable */ + if (status & AT91_UDP_ENDBUSRES) { + at91_udp_write(AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS); + at91_udp_write(AT91_UDP_IER, MINIMUS_INTERRUPTUS); + /* Atmel code clears this irq twice */ + at91_udp_write(AT91_UDP_ICR, AT91_UDP_ENDBUSRES); + at91_udp_write(AT91_UDP_ICR, AT91_UDP_ENDBUSRES); + VDBG("end bus reset\n"); + udc->addr = 0; + stop_activity(udc); + + /* enable ep0 */ + at91_udp_write(AT91_UDP_CSR(0), AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL); + udc->gadget.speed = USB_SPEED_FULL; + udc->suspended = 0; + at91_udp_write(AT91_UDP_IER, AT91_UDP_EP(0)); + + /* + * NOTE: this driver keeps clocks off unless the + * USB host is present. That saves power, and also + * eliminates IRQs (reset, resume, suspend) that can + * otherwise flood from the controller. If your + * board doesn't support VBUS detection, suspend and + * resume irq logic may need more attention... + */ + + /* host initiated suspend (3+ms bus idle) */ + } else if (status & AT91_UDP_RXSUSP) { + at91_udp_write(AT91_UDP_IDR, AT91_UDP_RXSUSP); + at91_udp_write(AT91_UDP_IER, AT91_UDP_RXRSM); + at91_udp_write(AT91_UDP_ICR, AT91_UDP_RXSUSP); + // VDBG("bus suspend\n"); + if (udc->suspended) + continue; + udc->suspended = 1; + + /* + * NOTE: when suspending a VBUS-powered device, the + * gadget driver should switch into slow clock mode + * and then into standby to avoid drawing more than + * 500uA power (2500uA for some high-power configs). + */ + if (udc->driver && udc->driver->suspend) + udc->driver->suspend(&udc->gadget); + + /* host initiated resume */ + } else if (status & AT91_UDP_RXRSM) { + at91_udp_write(AT91_UDP_IDR, AT91_UDP_RXRSM); + at91_udp_write(AT91_UDP_IER, AT91_UDP_RXSUSP); + at91_udp_write(AT91_UDP_ICR, AT91_UDP_RXRSM); + // VDBG("bus resume\n"); + if (!udc->suspended) + continue; + udc->suspended = 0; + + /* + * NOTE: for a VBUS-powered device, the gadget driver + * would normally want to switch out of slow clock + * mode into normal mode. + */ + if (udc->driver && udc->driver->resume) + udc->driver->resume(&udc->gadget); + + /* endpoint IRQs are cleared by handling them */ + } else { + int i; + unsigned mask = 1; + struct at91_ep *ep = &udc->ep[1]; + + if (status & mask) + handle_ep0(udc); + for (i = 1; i < NUM_ENDPOINTS; i++) { + mask <<= 1; + if (status & mask) + handle_ep(ep); + ep++; + } + } + } + + return IRQ_HANDLED; +} + +/*-------------------------------------------------------------------------*/ + +static struct at91_udc controller = { + .gadget = { + .ops = &at91_udc_ops, + .ep0 = &controller.ep[0].ep, + .name = driver_name, + .dev = { + .bus_id = "gadget" + } + }, + .ep[0] = { + .ep = { + .name = ep0name, + .ops = &at91_ep_ops, + }, + .udc = &controller, + .maxpacket = 8, + .creg = (void __iomem *)(AT91_VA_BASE_UDP + AT91_UDP_CSR(0)), + .int_mask = 1 << 0, + }, + .ep[1] = { + .ep = { + .name = "ep1", + .ops = &at91_ep_ops, + }, + .udc = &controller, + .is_pingpong = 1, + .maxpacket = 64, + .creg = (void __iomem *)(AT91_VA_BASE_UDP + AT91_UDP_CSR(1)), + .int_mask = 1 << 1, + }, + .ep[2] = { + .ep = { + .name = "ep2", + .ops = &at91_ep_ops, + }, + .udc = &controller, + .is_pingpong = 1, + .maxpacket = 64, + .creg = (void __iomem *)(AT91_VA_BASE_UDP + AT91_UDP_CSR(2)), + .int_mask = 1 << 2, + }, + .ep[3] = { + .ep = { + /* could actually do bulk too */ + .name = "ep3-int", + .ops = &at91_ep_ops, + }, + .udc = &controller, + .maxpacket = 8, + .creg = (void __iomem *)(AT91_VA_BASE_UDP + AT91_UDP_CSR(3)), + .int_mask = 1 << 3, + }, + .ep[4] = { + .ep = { + .name = "ep4", + .ops = &at91_ep_ops, + }, + .udc = &controller, + .is_pingpong = 1, + .maxpacket = 256, + .creg = (void __iomem *)(AT91_VA_BASE_UDP + AT91_UDP_CSR(4)), + .int_mask = 1 << 4, + }, + .ep[5] = { + .ep = { + .name = "ep5", + .ops = &at91_ep_ops, + }, + .udc = &controller, + .is_pingpong = 1, + .maxpacket = 256, + .creg = (void __iomem *)(AT91_VA_BASE_UDP + AT91_UDP_CSR(5)), + .int_mask = 1 << 5, + }, + /* ep6 and ep7 are also reserved */ +}; + +static irqreturn_t at91_vbus_irq(int irq, void *_udc, struct pt_regs *r) +{ + struct at91_udc *udc = _udc; + unsigned value; + + /* vbus needs at least brief debouncing */ + udelay(10); + value = at91_get_gpio_value(udc->board.vbus_pin); + if (value != udc->vbus) + at91_vbus_session(&udc->gadget, value); + + return IRQ_HANDLED; +} + +int usb_gadget_register_driver (struct usb_gadget_driver *driver) +{ + struct at91_udc *udc = &controller; + int retval; + + if (!driver + || driver->speed != USB_SPEED_FULL + || !driver->bind + || !driver->unbind + || !driver->setup) { + DBG("bad parameter.\n"); + return -EINVAL; + } + + if (udc->driver) { + DBG("UDC already has a gadget driver\n"); + return -EBUSY; + } + + udc->driver = driver; + udc->gadget.dev.driver = &driver->driver; + udc->gadget.dev.driver_data = &driver->driver; + udc->enabled = 1; + udc->selfpowered = 1; + + retval = driver->bind(&udc->gadget); + if (retval) { + DBG("driver->bind() returned %d\n", retval); + udc->driver = NULL; + return retval; + } + + local_irq_disable(); + pullup(udc, 1); + local_irq_enable(); + + DBG("bound to %s\n", driver->driver.name); + return 0; +} +EXPORT_SYMBOL (usb_gadget_register_driver); + +int usb_gadget_unregister_driver (struct usb_gadget_driver *driver) +{ + struct at91_udc *udc = &controller; + + if (!driver || driver != udc->driver) + return -EINVAL; + + local_irq_disable(); + udc->enabled = 0; + pullup(udc, 0); + local_irq_enable(); + + driver->unbind(&udc->gadget); + udc->driver = NULL; + + DBG("unbound from %s\n", driver->driver.name); + return 0; +} +EXPORT_SYMBOL (usb_gadget_unregister_driver); + +/*-------------------------------------------------------------------------*/ + +static void at91udc_shutdown(struct platform_device *dev) +{ + /* force disconnect on reboot */ + pullup(platform_get_drvdata(dev), 0); +} + +static int __devinit at91udc_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct at91_udc *udc; + int retval; + + if (!dev->platform_data) { + /* small (so we copy it) but critical! */ + DBG("missing platform_data\n"); + return -ENODEV; + } + + if (!request_mem_region(AT91_BASE_UDP, SZ_16K, driver_name)) { + DBG("someone's using UDC memory\n"); + return -EBUSY; + } + + /* init software state */ + udc = &controller; + udc->gadget.dev.parent = dev; + udc->board = *(struct at91_udc_data *) dev->platform_data; + udc->pdev = pdev; + udc_reinit(udc); + udc->enabled = 0; + + /* get interface and function clocks */ + udc->iclk = clk_get(dev, "udc_clk"); + udc->fclk = clk_get(dev, "udpck"); + if (IS_ERR(udc->iclk) || IS_ERR(udc->fclk)) { + DBG("clocks missing\n"); + return -ENODEV; + } + + retval = device_register(&udc->gadget.dev); + if (retval < 0) + goto fail0; + + /* disable everything until there's a gadget driver and vbus */ + pullup(udc, 0); + + /* request UDC and maybe VBUS irqs */ + if (request_irq(AT91_ID_UDP, at91_udc_irq, SA_INTERRUPT, driver_name, udc)) { + DBG("request irq %d failed\n", AT91_ID_UDP); + retval = -EBUSY; + goto fail1; + } + if (udc->board.vbus_pin > 0) { + if (request_irq(udc->board.vbus_pin, at91_vbus_irq, SA_INTERRUPT, driver_name, udc)) { + DBG("request vbus irq %d failed\n", udc->board.vbus_pin); + free_irq(AT91_ID_UDP, udc); + retval = -EBUSY; + goto fail1; + } + } else { + DBG("no VBUS detection, assuming always-on\n"); + udc->vbus = 1; + } + dev_set_drvdata(dev, udc); + create_debug_file(udc); + + INFO("%s version %s\n", driver_name, DRIVER_VERSION); + return 0; + +fail1: + device_unregister(&udc->gadget.dev); +fail0: + release_mem_region(AT91_VA_BASE_UDP, SZ_16K); + DBG("%s probe failed, %d\n", driver_name, retval); + return retval; +} + +static int __devexit at91udc_remove(struct platform_device *dev) +{ + struct at91_udc *udc = platform_get_drvdata(dev); + + DBG("remove\n"); + + pullup(udc, 0); + + if (udc->driver != 0) + usb_gadget_unregister_driver(udc->driver); + + remove_debug_file(udc); + if (udc->board.vbus_pin > 0) + free_irq(udc->board.vbus_pin, udc); + free_irq(AT91_ID_UDP, udc); + device_unregister(&udc->gadget.dev); + release_mem_region(AT91_BASE_UDP, SZ_16K); + + clk_put(udc->iclk); + clk_put(udc->fclk); + + return 0; +} + +#ifdef CONFIG_PM +static int at91udc_suspend(struct platform_device *dev, u32 state, u32 level) +{ + struct at91_udc *udc = platform_get_drvdata(dev); + + /* + * The "safe" suspend transitions are opportunistic ... e.g. when + * the USB link is suspended (48MHz clock autogated off), or when + * it's disconnected (programmatically gated off, elsewhere). + * Then we can suspend, and the chip can enter slow clock mode. + * + * The problem case is some component (user mode?) suspending this + * device while it's active, with the 48 MHz clock in use. There + * are two basic approaches: (a) veto suspend levels involving slow + * clock mode, (b) disconnect, so 48 MHz will no longer be in use + * and we can enter slow clock mode. This uses (b) for now, since + * it's simplest until AT91 PM exists and supports the other option. + */ + if (udc->vbus && !udc->suspended) + pullup(udc, 0); + return 0; +} + +static int at91udc_resume(struct platform_device *dev, u32 level) +{ + struct at91_udc *udc = platform_get_drvdata(dev); + + /* maybe reconnect to host; if so, clocks on */ + pullup(udc, 1); + return 0; +} +#else +#define at91udc_suspend NULL +#define at91udc_resume NULL +#endif + +static struct platform_driver at91_udc = { + .probe = at91udc_probe, + .remove = __devexit_p(at91udc_remove), + .shutdown = at91udc_shutdown, + .suspend = at91udc_suspend, + .resume = at91udc_resume, + .driver = { + .name = (char *) driver_name, + .owner = THIS_MODULE, + }, +}; + +static int __devinit udc_init_module(void) +{ + return platform_driver_register(&at91_udc); +} +module_init(udc_init_module); + +static void __devexit udc_exit_module(void) +{ + platform_driver_unregister(&at91_udc); +} +module_exit(udc_exit_module); + +MODULE_DESCRIPTION("AT91RM9200 udc driver"); +MODULE_AUTHOR("Thomas Rathbone, David Brownell"); +MODULE_LICENSE("GPL"); |